[osg-users] LineSegmentIntersector and MODEL Frame

[OpenSceneGraph Users]

Hi Chris,
I guess you want the scene to accept the IntersectionVisitor, not the
camera.
Laurens.

On Sat, Feb 1, 2020 at 1:18 PM OpenSceneGraph Users <
osg-users at lists.openscenegraph.org> wrote:

> I have a scene built with a few objects loaded, the most pertinent one
> being a large plane surface centered at the origin. I want to cast a ray
> from a particular point at a particular angle inside the scene and get a
> list of everything it intersects—both the point of intersection and the
> Node object. Most examples of using intersectors involve picking from the
> window, so I haven't seen exactly what I wanted. But from what I've read,
> the following should at least be close:
>
>     Vec3d start( 0.0, 0.0, 100.0 );
>     Vec3d end( 0.0, 0.0, -100.0 );
>     ref_ptr<LineSegmentIntersector> intsec = new LineSegmentIntersector(
> Intersector::MODEL, start, end );
>     IntersectionVisitor iv( intsec.get() );
>     viewer.getCamera()->accept( iv );
>     cout << intsec->containsIntersections() << endl;
>
> My start and end points in this snippet are well above and well below the
> surface object. So that plane object should definitely be intersected by a
> line running between them. However the containsIntersections function
> always returns false.
>
> Immediately after making this preliminary test pick, the program calls
> viewer.run() so I know everything is arranged as expected in the scene. So
> my guess is that I'm missunderstanding how the visitor works. Perhaps the
> accept() function is not what I should be using to execute the intersector?
>
>  ~ Chris
>
>
>
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